(n+(n+1))^2-n^2-(n+1)^2=612
4n^2+4n+1-2n^2-2n-1=612
2n^2+2n-612=0
n^2+n-306=0
D=1+1224=1225=35^2
n=(-1+35)/2=17
ответ: 17 и 18.
(n+(n+1))^2-n^2-(n+1)^2=612
4n^2+4n+1-2n^2-2n-1=612
2n^2+2n-612=0
n^2+n-306=0
D=1+1224=1225=35^2
n=(-1+35)/2=17
ответ: 17 и 18.